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SURGICAL TECHNIQUE

Vertebral body replacement system for the cervical, thoracic and lumbar spine.

SYNMESH

Instruments and implants approved by the AO Foundation.This publication is not intended for distribution in the USA.

Image intensifier control

This description alone does not provide sufficient background for direct use of DePuy Synthes products. Instruction by a surgeon experienced in handling these products is highly recommended.

Processing, Reprocessing, Care and MaintenanceFor general guidelines, function control and dismantling of multi-part instruments, as well as processing guidelines for implants, please contact your local sales representative or refer to:http://emea.depuysynthes.com/hcp/reprocessing-care-maintenanceFor general information about reprocessing, care and maintenance of Synthes reusable devices, instrument trays and cases, as well as processing of Synthes non-sterile implants, please consult the Important Information leaflet (SE_023827) or refer to: http://emea.depuysynthes.com/hcp/reprocessing-care-maintenance

http://emea.depuysynthes.com/hcp/reprocessing-care-maintenance

http://emea.depuysynthes.com/hcp/reprocessing-care-maintenance

SynMesh Surgical Technique DePuy Synthes 1

AO Spine Principles 2

Indications 3

Round Implants 4

Oblong Implants 6

Locking Screws 9

Surgical Technique 10

Instruments 17

Bibliography 19

Table of Contents

coronalaxial

sagittal

2 DePuy Synthes SynMesh Surgical Technique

Copyright © 2012 by AOSpine

The four principles to be considered as the foundation for proper spine patient management underpin the design and delivery of the Curriculum: Stability – Alignment – Biology – Function.1,2

FunctionPreservations and resto-ration of function to prevent disability

StabilityStabilization to achieve a specifi c therapeutic out-come

AlignmentBalancing the spine in three dimensions

BiologyEtiology, pathogenesis, neural protection, and tissue healing

AO Spine Principles

1 Aebi et al (1998)2 Aebi et al (2007)


Indications

SynMesh is a vertebral body replacement device for the cer-vical, thoracic and lumbar spine. Titanium implants in various footprints and heights enable the surgeon to choose the configuration that is best suited to the patient’s individual pathology and anatomy. The mesh may also be trimmed for a custom fit.

The implants can be inserted anteriorly, laterally or anterola-terally.

Indications – To replace collapsed, damaged or unstable vertebral bod-

ies due to tumour or trauma (e.g. fractures)

SynMesh has to be used with a supplemental internal fixa-tion system, e.g. TeleFix, CSLP or USS II.

B 10 mm

B 12 mm

B 15 mm


The round implants are designed to treat defects in the cervical spine.

Round Implants

SynMesh, Corpectomy Device, Pure Titanium

Art. No. B height

495.341 10 mm 4 mm

495.342 10 mm 6 mm

495.343 10 mm 10 mm

495.344 10 mm 18 mm

495.441 10 mm 5 mm

495.442 10 mm 7 mm

495.443 10 mm 8 mm

495.444 10 mm 9 mm

495.445 10 mm 11 mm

495.446 10 mm 12 mm

495.346 12 mm 4 mm

495.347 12 mm 5 mm

495.348 12 mm 6 mm

495.349 12 mm 7 mm

495.351 12 mm 8 mm

495.352 12 mm 9 mm

495.353 12 mm 10 mm

495.354 12 mm 11 mm

495.355 12 mm 12 mm

495.356 12 mm 32 mm

495.357 12 mm 88 mm

495.451 12 mm 18 mm

495.361 15 mm 8 mm

495.362 15 mm 10 mm

495.363 15 mm 12 mm

495.364 15 mm 14 mm

495.365 15 mm 32 mm

495.366 15 mm 88 mm

495.455 15 mm 16 mm

12 mm 15 mm10 mm

12 mm 15 mm10 mm


End Rings, round, with locking screw (convex)

Art. No. B Angle

495.411 10 mm 0°

495.414 10 mm 2.5°

495.412 12 mm 0°

495.415 12 mm 2.5°

495.413 15 mm 0°

495.416 15 mm 2.5°

End Rings, round, press fit*

Art. No. B Angle

495.384 10 mm 0°

495.387 10 mm 2.5°

495.385 12 mm 0°

495.388 12 mm 2.5°

495.386 15 mm 0°

495.389 15 mm 2.5°

*No locking screw needed

End Rings, round – Two fastening mechanisms available: press fit or with

locking screw – Angles of 0° or 2.5° – Each end ring increases the overall height of the implant

by 1.5 mm (see step 3 of the Surgical technique)

17×22 mm

22×28 mm

26×33 mm


The oblong implants are designed to treat defects in the thoracic and lumbar spine.

Oblong Implants

SynMesh, Corpectomy Device, Pure Titanium

Art. No. Dimensions height

495.371 17 × 22 mm 8 mm

495.372 17 × 22 mm 12 mm

495.373 17 × 22 mm 32 mm

495.374 17 × 22 mm 88 mm

495.461 17 × 22 mm 6 mm

495.462 17 × 22 mm 10 mm

495.463 17 × 22 mm 14 mm

495.464 17 × 22 mm 20 mm

495.465 17 × 22 mm 22 mm

495.466 17 × 22 mm 24 mm

495.467 17 × 22 mm 26 mm

495.468 17 × 22 mm 28 mm

495.469 17 × 22 mm 52 mm

495.376 22 × 28 mm 8 mm

495.377 22 × 28 mm 12 mm

495.378 22 × 28 mm 64 mm

495.379 22 × 28 mm 88 mm

495.471 22 × 28 mm 6 mm

495.472 22 × 28 mm 10 mm

495.473 22 × 28 mm 14 mm

495.474 22 × 28 mm 28 mm

495.475 22 × 28 mm 30 mm

495.476 22 × 28 mm 32 mm

495.477 22 × 28 mm 34 mm

495.478 22 × 28 mm 36 mm

495.479 22 × 28 mm 52 mm

495.381 26 × 33 mm 64 mm

495.382 26 × 33 mm 88 mm

495.481 26 × 33 mm 6 mm

495.482 26 × 33 mm 8 mm

495.483 26 × 33 mm 10 mm

495.484 26 × 33 mm 12 mm

495.485 26 × 33 mm 14 mm

495.486 26 × 33 mm 44 mm

495.487 26 × 33 mm 46 mm

495.488 26 × 33 mm 48 mm

495.489 26 × 33 mm 50 mm

495.490 26 × 33 mm 52 mm

17×22 mm 22×28 mm 26×33 mm

17×22 mm 22×28 mm 26×33 mm


End Rings, oblong, press fit*

Anterolateral end rings

Art. No. Dimensions Angle

495.391 17×22 mm 0°

495.393 17×22 mm 5°

495.395 22×28 mm 0°

495.397 22×28 mm 5°

495.399 26×33 mm 0°

495.402 26×33 mm 5°

End Rings, oblong – Two fastening mechanisms available: press fit or with

locking screw – Angles of 0° or 5° – Different configurations feature slots for anterolateral, lat-

eral or anterior insertion under distraction – Each end ring increases the overall height of the implant

by 3.5 mm (see step 3 of the Surgical technique)

*No locking screw needed

Lateral or anterior end rings


495.392 17×22 mm 0°

495.394 17×22 mm 5°

495.396 22×28 mm 0°

495.398 22×28 mm 5°

495.401 26×33 mm 0°

495.403 26×33 mm 5°

17×22 mm 22×28 mm 26×33 mm

Standard Rings

The standard rings fit inside the oblong mesh and are se-cured using two M3 locking screws (495.491). They provide added stability, particularly for long implants.

Standard Rings

Art. No. Dimensions

495.405 17×22 mm

495.406 22×28 mm

495.407 26×33 mm

17×22 mm

17×22 mm

22×28 mm

22×28 mm

26×33 mm

26×33 mm

Lateral or anterior end rings


495.422 17×22 mm 0°

495.424 17×22 mm 5°

495.428 22×28 mm 0°

495.430 22×28 mm 5°

495.434 26×33 mm 0°

495.436 26×33 mm 5°

End Rings, oblong, with locking screw (convex)

Anterolateral end rings


495.421 17×22 mm 0°

495.423 17×22 mm 5°

495.427 22×28 mm 0°

495.429 22×28 mm 5°

495.433 26×33 mm 0°

495.435 26×33 mm 5°


Oblong Implants

M2

M3

M3


End rings with locking screw are fixed with one screw only.

For round end rings with locking screw: – Locking Screw M2, low profile (495.410),

for B 10 mm und 12 mm end rings

– Locking Screw M3, low profile (495.491), for B 15 mm end rings

Matching screwdrivers: – Screwdriver Shaft 2.0, cruciform, with Holding Sleeve and

Mini Quick Coupling (314.672) and Handle, small, with Mini Quick Coupling (311.011) for locking screws M2

– Screwdriver, hexagonal (314.250) for locking screws M3

For oblong end rings with locking screw and for standard rings: – Locking Screw M3, low profile (495.491)

Matching screwdriver: – Screwdriver, hexagonal (314.250) for locking screws M3

Locking Screws


Surgical Technique

1Select approach

SynMesh can be inserted anteriorly, laterally or anterolater-ally, depending on the spinal level involved.

2Perform corpectomy and prepare endplates

Perform a partial or complete corpectomy depending on the patient’s pathology. Remove the superficial layers of the car-tilaginous endplates until bleeding bone is exposed.

Precaution: Excessive removal of subchondral bone may weaken the vertebral endplates. If the entire endplate is re-moved, subsidence into the adjacent vertebrae and a loss of segmental stability may result.

6050

4010

6050

4010


3

Determine implant sizeDistract the affected segment using the parallel Spreader Forceps (389.187 or 389.188).

The scale on the handle indicates the height of the defect.

Alternatively, the Calliper for Corpectomy (389.186) can be used to determine the height of the defect.

When determining the implant size:

– Add a total of 3 mm to the mesh height if using round end rings

– Add a total of 7 mm to the mesh height if using oblong end rings

Mesh Height

Mesh Height

Oblong Round

Construct height

1.5 mm

1.5 mm

3.5 mm

3.5 mm


4

Cut mesh (optional)If necessary, use the SynMesh Cutter (397.091) to trim the mesh to the appropriate height.

a. Mesh, round, B 10 mm and 12 mmMake diagonal cuts.

b. Mesh, round, B 15 mm and all oblong meshesMake diagonal or horizontal cuts.

To determine if the tabs of the mesh need to be adjusted with the Universal Bending Pliers (391.963) line up the de-sired end rings with the mesh and adjust tabs as necessary.

Note: If an end ring with locking screw is used, the mesh has to be cut on the horizontal.

Surgical Technique


The following section describes the securing technique for end rings with locking screw. Alternatively, press fit end rings may be used.

5Attach first end ring

Attach desired end ring to mesh.

a. SynMesh, round, B 10 mm and 12 mm Secure end ring with a locking screw M2 (495.410) using the Cruciform Screwdriver Shaft 2.0 (314.672) and handle with Mini Quick Coupling (311.011).

b. SynMesh, round, B 15 mm and all oblong SynMesh implants Secure end ring with a locking screw M3 (495.491) using the hexagonal screwdriver (314.250).

Note: Check to ensure that end rings are correctly secured. The locking screw can only be inserted correctly through one hole. If the screw is inserted in the wrong hole, a gap will re-main between the end ring and the mesh. In this case, re-move the screw and secure it in the correct hole.

Option:Fill SynMesh with bone graft or a bone substitute material such as chronOS.


6Attach second end ring

Attach second end ring as described in the previous step.

Note: If using a longer construct, a standard ring may be in-serted for added stability. Place the standard ring inside the mesh at the desired location. Using the hexagonal screw-driver, insert two locking screws M3 through the mesh and into the standard ring to secure it in place.

Note: Pack additional bone graft or bone substitute inside the end rings as needed.

Surgical Technique

2

1

3


7Distract and insert implant

Using the parallel spreader forceps, distract the affected seg-ment until the desired spinal alignment is achieved (1). While under distraction, insert the SynMesh implant using the ap-propriate implant holder (396.388, 396.389) (2).

Note: When using oblong end rings, ensure that the blades of the spreader forceps align with the slots in the end rings (3). When using round meshes the spreader forceps must be removed before implantation.

Final seating of the implant may be accomplished by gently tapping the implant holder. Once the implant is in place, carefully remove the implant holder and spreader forceps. Appropriate impactors may be used if necessary to achieve final seating of the implant.

Verify the position of SynMesh in relation to the vertebral bodies in the frontal and sagittal planes intraoperatively using an image intensifier.


8Apply bone material

The area around SynMesh close to the vascularised tissue is the area most likely to fuse and provide stability later on. Therefore fill this area with the largest possible amount of bone graft, especially the anterior part of the instrumented zone.

9Apply supplemental fixation

As with all vertebral body replacement devices, SynMesh must be combined with a supplemental internal fixation sys-tem – e.g. TeleFix, CSLP or USS II – which is capable of ab-sorbing tensile forces as well as torsional, flexion and exten-sion moments.

Implant RemovalSynMesh implants are not intended to be removed. If removal is required, spreader forceps and implant holder may be used to remove SynMesh implant.

Surgical Technique

311.011 Handle, small, with Mini Quick Coupling

314.250 Screwdriver, hexagonal, small, B 2.5 mm, with Groove, length 250 mm

314.672 Screwdriver Shaft 2.0, cruciform, with Holding Sleeve, length 66 mm, with Mini Quick Coupling

389.186 Calliper for Corpectomy, Stainless Steel

389.187 Spreader Forceps, parallel, distraction width 0 to 70 mm, Stainless Steel

389.188 Spreader Forceps, parallel, distraction width 30 to 95 mm, Stainless Steel

391.963 Universal Bending Pliers, length 165 mm


Instruments

396.388 SynMesh Implant Holder, with small tips, Stainless Steel

396.389 SynMesh Implant Holder, with large tips, Stainless Steel

397.091 SynMesh Cutter, Stainless Steel


Instruments


Aebi M, Thalgott JS, Webb JK (1998): AO ASIF Principles in Spine Surgery. Berlin: Springer.

Aebi M, Arlet V, Webb JK (2007): AOSPINE Manual (2 vols), Stuttgart, New York: Thieme.

Bibliography

Synthes GmbHEimattstrasse 34436 OberdorfSwitzerlandTel: +41 61 965 61 11Fax: +41 61 965 66 00www.depuysynthes.com 0123 ©

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Not all products are currently available in all markets.

This publication is not intended for distribution in the USA.

All surgical techniques are available as PDF files at www.depuysynthes.com/ifu

http://www.depuysynthes.com/ifu

synmeshsynthes.vo.llnwd.net/o16/llnwmb8/int mobile/synthes...22×28 mm 26×33495.490 mm 6 depuy...

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